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17 Cards in this Set
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 Back
Newton's first law of motion (the law of inertia)

Every object continues in its state of rest, or of uniform motion in a straight line, unless compelled to change that state by forces impressed upon it


Inertia

The property of things to resist changes in motion


Force

In the simplest sense, a push or a pull


Net Force

The vector sum of forces that act on an object


Mechanical Equilibrium

The state of an object or system of objects for which there are no changes in motion. In accord with Newton's first law, if at rest, the state of rest persists. If moving, motion continues w/o change


Equilibrium rule

For any object or system of objects in equilibrium, the sum of the forces acting equals zero. In equation for EF=0


Speed

How fast something moves; the distance traveled per unit of time


Velocity

The speed of an object and a specification of its direction of motion


Vector quantity

Quantity in physics that has both magnitude and direction


Acceleration

The rate at which velocity changes with time; the change in velocity may be in magnitude, or direction, or both


Free Fall

Motion under the influence of gravity only


Speed

D/T interval


Average speed

total D covered/T interval


Acceleration

change of V/T interval


Acceleration (along a straight line)

change in S/T interval


Velocity acquired in free fall from rest

V = gt


Distance fallen in free fall, from rest

D=(1/2)gt^2
